DS0708 - Données massives et calcul intensif : enjeux et synergies pour la simulation numérique

Wavelet graphs and their application to the direct detection of gravitational waves – wavegraph

Submission summary

Einstein's Theory of General Relativity predicts the existence of gravitational
waves (GW). A worldwide network of next generation laser interferometers aims at
making the first direct detection of GWs from astrophysical sources such as
coalescing binaries of neutron-stars and/or black-holes. It will start taking
science data by the end of this year (2015). The first discovery of GWs is
expected within the decade; this will open an entirely new view of the universe.

GW data analysis has reached maturity. Important milestones have been reached
during the last science runs. However, a number of important and challenging
issues remain open. GW transient detection (our focus here) is very much
constrained by important computational requirements. This proposal has the
overall objective of improving the analysis of second-generation data and ensure
its readiness for the upcoming first GW detection.

Coalescing binaries of neutron stars and/or black holes (in short, CBCs, for
compact binary coalescences) are considered one of the most promising sources of
GWs. The last minutes before the binary merges coincide with the emission of an
intense burst of GWs. An accurate modeling of the dynamics of the binary shows
that the GW waveform is a quasi-periodic signal with a frequency increasing
according to a power law with time, i.e. a chirp.

When dealing with multiple detectors, the most sensitive searches
analyze the data streams coherently, using sensor array techniques
analog to the beam-forming methods used in radio astronomy, for
instance. For CBC signals, coherent matched filtering searches are
known to be the most sensitive. However, this type of analysis is very
computationally demanding and unfeasible in practice.

We propose to address this issue with a new search method for such
signals based on wavelet graphs. This proposal builds an
interdisciplinary team that gathers together
mathematicians/statisticians and physicists/data analysis experts that
will collaborate to resolve intimately coupled methodological and
implementation issues, and to deliver a functional data analysis
pipeline ready for production, that will be applied to the scientific
data gathered by the gravitational wave interferometers of the latest
generation.

Project coordination

Eric Chassande-Mottin (AstroParticule et Cosmologie)

The author of this summary is the project coordinator, who is responsible for the content of this summary. The ANR declines any responsibility as for its contents.

Partner

L2S Laboratoire des Signaux & Systèmes
APC AstroParticule et Cosmologie

Help of the ANR 171,933 euros
Beginning and duration of the scientific project: September 2015 - 36 Months

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